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library(readxl)
library(lmtest) 
Loading required package: zoo

Attaching package: ‘zoo’

The following objects are masked from ‘package:base’:

    as.Date, as.Date.numeric
library(forecast)
Registered S3 method overwritten by 'quantmod':
  method            from
  as.zoo.data.frame zoo 
This is forecast 8.21.1 
  Want to meet other forecasters? Join the International Institute of Forecasters:
  http://forecasters.org/
library(DIMORA)
Loading required package: minpack.lm
Loading required package: numDeriv
Loading required package: reshape2
Loading required package: deSolve
library(fpp2)
── Attaching packages ──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── fpp2 2.5 ──
✔ ggplot2   3.4.4     ✔ expsmooth 2.3  
✔ fma       2.5       
library(ggplot2)
library(plotly)

Attaching package: ‘plotly’

The following object is masked from ‘package:ggplot2’:

    last_plot

The following object is masked from ‘package:stats’:

    filter

The following object is masked from ‘package:graphics’:

    layout
library(tseries)

    ‘tseries’ version: 0.10-55

    ‘tseries’ is a package for time series analysis and computational finance.

    See ‘library(help="tseries")’ for details.
library(randomForest)
randomForest 4.7-1.1
Type rfNews() to see new features/changes/bug fixes.

Attaching package: ‘randomForest’

The following object is masked from ‘package:ggplot2’:

    margin
library(BASS)
library(Metrics) 

Attaching package: ‘Metrics’

The following object is masked from ‘package:forecast’:

    accuracy
library(dplyr)

Attaching package: ‘dplyr’

The following object is masked from ‘package:randomForest’:

    combine

The following objects are masked from ‘package:stats’:

    filter, lag

The following objects are masked from ‘package:base’:

    intersect, setdiff, setequal, union
library(tibble)
# folder_path = "~/Desktop/unipd/time-series/project/data/"
folder_path = "./data/"

# shares_file <- paste0(folder_path, "us-total-share-prices.csv")
# m2_file <- paste0(folder_path, "us-M2.csv")
# usir_file <- paste0(folder_path, "us-interest-rate.csv")
euir_file <- paste0(folder_path, "eu-interest-rate.csv")
# uscpi_file <- paste0(folder_path, "us-consumer-price-index.csv")
eucpi_file <- paste0(folder_path, "eu-consumer-price-index.csv")
rate_file <- paste0(folder_path, "euro-daily-hist_1999_2022.csv")
  

# shares<- read.csv(shares_file)
# usm2 <- read.csv(m2_file)
# usir <- read.csv(usir_file)
euir <- read.csv(euir_file)
# uscpi <- read.csv(uscpi_file)
eucpi <- read.csv(eucpi_file)
rate <- read.csv(rate_file)
# ### Looking at share price
# shares$DATE <- as.Date(shares$DATE)
# 
# # plot(shares$DATE, shares$SPASTT01USM661N, xlab = "Time", ylab = "Price")
# gg <- ggplot(shares, aes(x = DATE, y = SPASTT01USM661N))+
#   geom_line(aes(group = 1), color = "blue", linewidth = 0.5) +
#   geom_point() +
#   labs(
#     title = "Total Share Prices Change with Time",
#     x = "Time",
#     y = "Index 2015 = 100"
#   ) +
#   scale_x_date(date_labels = "%Y-%m", date_breaks = "1 year") +
#   theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))
# 
# plotly_gg <- ggplotly(gg)
# 
# plotly_gg
### There is a clear increasing trend that is confirmed by the ACF being the highest
### at the smaller lags
# ggAcf(shares$SPASTT01USM661N, lag = 760)
### Attempting modeling share prices with Naive Method
# nmshares_model <- meanf(shares$SPASTT01USM661N, h = 1)
# plot(nmshares_model)
## Checking residuals
# nmshares_res <- residuals(nmshares_model)
# autoplot(ts(nmshares_res)) + xlab("Month") + ylab("") +
#   ggtitle("Residuals from Naive Method")
# gg_hist <- gghistogram(nmshares_res) + ggtitle("Histogram of Naive Method Residuals")
# ggplotly(gg_hist)
# ggAcf(nmshares_res, lag = 760)
### Attempting modeling share prices with linear regression model
# shares_lm = lm(shares$SPASTT01USM661N~ shares$DATE)
# summary(shares_lm) ###R^2 value of 83.96%
# tt <- 1:NROW(shares)
# plot(tt, shares$SPASTT01USM661N, xlab="Time", ylab="Index 2015 = 100", type = "p")
# abline(shares_lm)
head(euir)

euir$DATE <- as.Date(euir$DATE)
euir_df <- data.frame(date = euir$DATE, interest_rate = euir$IRSTCI01EZM156N)
summary(euir_df$interest_rate)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
-0.5847 -0.0506  2.0518  1.9590  3.7900  6.8400 
ggplot(euir_df, aes(x = date, y = interest_rate)) +
  geom_line() +
  labs(title = "Euro Interest Rate Over Time",
       x = "Date", y = "Interest Rate")

# Check for Stationarity (Augmented Dickey-Fuller test)
adf.test(euir_df$interest_rate)

    Augmented Dickey-Fuller Test

data:  euir_df$interest_rate
Dickey-Fuller = -2.0654, Lag order = 7, p-value = 0.5493
alternative hypothesis: stationary
# Autocorrelation and Partial Autocorrelation Plots
ggtsdisplay(euir_df$interest_rate, lag = 900)

ggAcf(euir_df$interest_rate, lag.max = 700)

Linear regression model

train_data <- euir_df[1:(nrow(euir_df) - 3), ]
test_data <- euir_df[(nrow(euir_df) - 2):nrow(euir_df), ]

model <- lm(interest_rate ~ date, data = train_data)

summary(model)

Call:
lm(formula = interest_rate ~ date, data = train_data)

Residuals:
    Min      1Q  Median      3Q     Max 
-1.4724 -0.6525 -0.3006  0.3833  4.4335 

Coefficients:
              Estimate Std. Error t value Pr(>|t|)    
(Intercept)  1.030e+01  2.503e-01   41.16   <2e-16 ***
date        -5.909e-04  1.729e-05  -34.18   <2e-16 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 1.012 on 352 degrees of freedom
Multiple R-squared:  0.7685,    Adjusted R-squared:  0.7678 
F-statistic:  1168 on 1 and 352 DF,  p-value: < 2.2e-16
predictions <- predict(model, newdata = test_data)
residuals <- residuals(model)
residuals_test <- residuals(model)[1:nrow(test_data)]
rmse_value <- rmse(predictions, test_data$interest_rate)
mae_value <- mae(predictions, test_data$interest_rate)

cat("RMSE:", rmse_value, "\n")
RMSE: 4.842428 
cat("MAE:", mae_value, "\n")
MAE: 4.840305 
plot(test_data$date, test_data$interest_rate, col = "blue", type = "l", xlab = "Date", ylab = "Interest Rate")
lines(test_data$date, predictions, col = "red")
legend("topleft", legend = c("Actual", "Predicted"), col = c("blue", "red"), lty = 1)

# Residuals plot
plot(test_data$date, residuals_test, col = "green", type = "l", xlab = "Date", ylab = "Residuals")


plot(train_data$date, residuals, col = "green", type = "l", xlab = "Date", ylab = "Residuals train")

result_table <- data.frame(
  Date = test_data$date,
  Actual = test_data$interest_rate,
  Predicted = predictions
)

print(result_table)
dwtest(model)

    Durbin-Watson test

data:  model
DW = 0.029354, p-value < 2.2e-16
alternative hypothesis: true autocorrelation is greater than 0
ARIMA
```r train_data <- euir_df[1:(nrow(euir_df) - 3), ] test_data <- euir_df[(nrow(euir_df) - 2):nrow(euir_df), ]
arima_model <- auto.arima(train_data$interest_rate)
summary(arima_model) ```
``` Series: train_data$interest_rate ARIMA(0,2,1)
Coefficients: ma1 -0.7618 s.e. 0.0400
sigma^2 = 0.02614: log likelihood = 142 AIC=-279.99 AICc=-279.96 BIC=-272.26
Training set error measures: ME RMSE MAE MPE MAPE MASE ACF1 Training set 0.004576847 0.1609926 0.09655125 -0.5811529 11.74419 0.9702804 -0.03495108 ```
r # Forecasting for the next 3 months arima_forecast <- forecast(arima_model, h = 3) print(arima_forecast)
r arima_pred_values <- arima_forecast$mean
r # Plotting ARIMA Forecast plot(arima_forecast, xlab = "Date", ylab = "Interest Rate Forecast")
r # ARIMA residuals arima_residuals <- residuals(arima_model) plot(train_data$date, arima_residuals, col = "green", type = "l", xlab = "Date", ylab = "ARIMA Residuals")
r forecasted_values <- arima_forecast$mean actual_values <- as.numeric(test_data$interest_rate) arima_residuals_test <- actual_values - forecasted_values
```r #ARIMA forecasted values and residuals arima_table <- data.frame( Date = index(test_data), Actual_Values = actual_values, Forecasted_Interest_Rate = forecasted_values, Residuals = arima_residuals_test )
# Print the ARIMA forecast and residuals table print(arima_table) ```
r NA
r # Plotting ARIMA predicted values and residuals for the test data plot(test_data$date, arima_pred_values, col = "blue", type = "l", xlab = "Date", ylab = "ARIMA Predicted Values") lines(test_data$date, arima_residuals_test, col = "green")
```r legend(“topright”, legend = c(“Predicted Values”, “Residuals”), col = c(“blue”, “green”), lty = 1)
```
head(eucpi)

eucpi$DATE <- as.Date(eucpi$DATE)
eucpi_df <- data.frame(date = eucpi$DATE, cp_index = eucpi$EA19CPALTT01GYM)
summary(eucpi_df$cp_index)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
  -0.60    1.30    2.10    2.19    2.60   10.60 
ggplot(eucpi_df, aes(x = date, y = cp_index)) +
  geom_line() +
  labs(title = "Euro CP Index Over Time",
       x = "Date", y = "Index Rate")

# Check for Stationarity (Augmented Dickey-Fuller test)
adf.test(eucpi_df$cp_index)

    Augmented Dickey-Fuller Test

data:  eucpi_df$cp_index
Dickey-Fuller = -3.6941, Lag order = 7, p-value = 0.02453
alternative hypothesis: stationary
# Autocorrelation and Partial Autocorrelation Plots
ggtsdisplay(eucpi_df$cp_index, lag = 900)

ggAcf(eucpi_df$cp_index, lag.max = 700)

LINEAR REGRESSION

train_data <- eucpi_df[1:(nrow(eucpi_df) - 3), ]
test_data <- eucpi_df[(nrow(eucpi_df) - 2):nrow(eucpi_df), ]

model <- lm(cp_index ~ date, data = train_data)

summary(model)

Call:
lm(formula = cp_index ~ date, data = train_data)

Residuals:
    Min      1Q  Median      3Q     Max 
-2.6457 -0.7591 -0.1226  0.3644  8.9977 

Coefficients:
              Estimate Std. Error t value Pr(>|t|)    
(Intercept)  3.368e+00  3.097e-01  10.875  < 2e-16 ***
date        -9.163e-05  2.231e-05  -4.107 4.91e-05 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 1.464 on 380 degrees of freedom
Multiple R-squared:  0.0425,    Adjusted R-squared:  0.03998 
F-statistic: 16.87 on 1 and 380 DF,  p-value: 4.912e-05
predictions <- predict(model, newdata = test_data)
residuals <- residuals(model)
residuals_test <- residuals(model)[1:nrow(test_data)]
rmse_value <- rmse(predictions, test_data$cp_index)
mae_value <- mae(predictions, test_data$cp_index)

cat("RMSE:", rmse_value, "\n")
RMSE: 7.75817 
cat("MAE:", mae_value, "\n")
MAE: 7.736682 
plot(test_data$date, test_data$cp_index, col = "blue", type = "l", xlab = "Date", ylab = "EU Consumer Price INdex")
lines(test_data$date, predictions, col = "red")
legend("topleft", legend = c("Actual", "Predicted"), col = c("blue", "red"), lty = 1)

# Residuals plot
plot(test_data$date, residuals_test, col = "green", type = "l", xlab = "Date", ylab = "Residuals test")


plot(train_data$date, residuals, col = "green", type = "l", xlab = "Date", ylab = "Residuals train")

result_table <- data.frame(
  Date = test_data$date,
  Actual = test_data$cp_index,
  Predicted = predictions
)

print(result_table)
dwtest(model)

    Durbin-Watson test

data:  model
DW = 0.036438, p-value < 2.2e-16
alternative hypothesis: true autocorrelation is greater than 0

ARIMA (CP Index)

train_data <- eucpi_df[1:(nrow(eucpi_df) - 3), ]
test_data <- eucpi_df[(nrow(eucpi_df) - 2):nrow(eucpi_df), ]

arima_model <- auto.arima(train_data$cp_index)

summary(arima_model)
Series: train_data$cp_index 
ARIMA(1,2,1) 

Coefficients:
         ar1      ma1
      0.0681  -0.8891
s.e.  0.0620   0.0339

sigma^2 = 0.07102:  log likelihood = -36.41
AIC=78.82   AICc=78.89   BIC=90.64

Training set error measures:
                     ME      RMSE       MAE MPE MAPE      MASE         ACF1
Training set 0.00887859 0.2651023 0.1945961 Inf  Inf 0.9980657 -0.002914337
# Forecasting for the next 3 months
arima_forecast <- forecast(arima_model, h = 3)
arima_pred_values <- arima_forecast$mean
print(arima_forecast)
# Plotting ARIMA Forecast
plot(arima_forecast, xlab = "Date", ylab = "CP Index Forecast")

# ARIMA residuals
arima_residuals <- residuals(arima_model)
plot(train_data$date, arima_residuals, col = "green", type = "l", xlab = "Date", ylab = "ARIMA Residuals")

forecasted_values <- arima_forecast$mean
actual_values <- as.numeric(test_data$cp_index)
arima_residuals_test <- actual_values - forecasted_values
#ARIMA forecasted values and residuals
arima_table <- data.frame(
  Date = index(test_data),
  Actual_Values = actual_values,
  Forecasted_CP_Index = forecasted_values,
  Residuals = arima_residuals_test
)

# Print the ARIMA forecast and residuals table
print(arima_table)
NA
# Plotting ARIMA predicted values and residuals for the test data
plot(test_data$date, arima_pred_values, col = "blue", type = "l", xlab = "Date", ylab = "ARIMA Predicted Values")
lines(test_data$date, arima_residuals_test, col = "green")
legend("topright", legend = c("Predicted Values", "Residuals"), col = c("blue", "green"), lty = 1)


US RATE

rate$Period.Unit. <- as.Date(rate$Period.Unit.)
rate_df <- data.frame(Date = rate$Period.Unit., US_rate = rate$X.US.dollar..)
rate_df <- rate_df %>% 
  mutate(Date = format(Date, "%Y-%m"))
head(rate_df)
filtered_data <- rate_df %>%
  group_by(Date) %>%
  summarize(mean_rate = mean(as.numeric(US_rate)))
Warning: There were 42 warnings in `summarize()`.
The first warning was:
ℹ In argument: `mean_rate = mean(as.numeric(US_rate))`.
ℹ In group 12: `Date = "1999-12"`.
Caused by warning in `mean()`:
! NAs introduced by coercion
ℹ Run ]8;;ide:run:dplyr::last_dplyr_warnings()dplyr::last_dplyr_warnings()]8;; to see the 41 remaining warnings.
filtered_data$Date <- paste0(filtered_data$Date, '-01')
filtered_data$Date <- as.Date(filtered_data$Date)
head(filtered_data)
summary(filtered_data$mean_rate)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max.    NA's 
 0.8532  1.0982  1.1786  1.1900  1.2987  1.5770      42 
ggplot(filtered_data, aes(x = Date, y = mean_rate)) +
  geom_line() +
  labs(
    title = "US Rate Over Time",
    x = "Time", 
    y = "US Rate"
    )

gg <- ggplot(filtered_data, aes(x = Date, y = mean_rate))+
  geom_line(aes(group = 1), color = "blue", linewidth = 0.5) +
  geom_point() +
  labs(
    title = "US Rate",
    x = "Time",
    y = "Rate"
  ) +
  scale_x_date(date_labels = "%Y-%m", date_breaks = "1 year") +
  theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))

plotly_gg <- ggplotly(gg)

plotly_gg
str(euir_df)
'data.frame':   357 obs. of  2 variables:
 $ date         : Date, format: "1994-01-01" "1994-02-01" "1994-03-01" "1994-04-01" ...
 $ interest_rate: num  6.84 6.73 6.68 6.22 5.85 6.32 6.27 5.94 6 6.13 ...
str(filtered_data)
tibble [293 × 2] (S3: tbl_df/tbl/data.frame)
 $ Date     : Date[1:293], format: "1999-01-01" "1999-02-01" "1999-03-01" "1999-04-01" ...
 $ mean_rate: num [1:293] 1.16 1.12 1.09 1.07 1.06 ...
merged_df <- merge(merge(euir_df, eucpi_df, by = "date"), filtered_data, by.x = "date", by.y = "Date")
names(merged_df) <- c("date", "eu_ir", "eu_cpi", "us_rate")
head(merged_df)
tail(merged_df)

ARIMAX (US rate + EU interest rate)

merged_df$date <- as.Date(merged_df$date)
us_ts <- ts(merged_df$us_rate, frequency = 12, start = c(1999, 1))
# Split the data into train and test sets
train_data <- window(us_ts, start = c(1999, 1), end = c(2022, 10))
test_data <- window(us_ts, start = c(2022, 11))

external_regressor <- merged_df$eu_ir[merged_df$date >= as.Date("1999-01-01") & merged_df$date <= as.Date("2022-10-01")]
fit <- Arima(train_data, order = c(1, 0, 1), xreg = external_regressor)

forecast_values <- forecast(fit, xreg = merged_df$eu_ir[merged_df$date >= as.Date("2022-11-01")], h = 3)
predicted_values <- forecast_values$mean
actual_values <- window(us_ts, start = c(2022, 11))
result_table <- tibble(
  Date = time(actual_values),
  Actual_Values = actual_values,
  Predicted_Values = predicted_values
)
plot(forecast_values, main = "ARIMAX Forecast for US Rate")
lines(actual_values, col = "blue")
legend("topleft", legend = c("Actual", "Forecast"), col = c("blue", "black"), lty = 1)

print(result_table)

ARIMAX (US rate + EU Consumer Price Index)

# Split the data into train and test sets
train_data <- window(us_ts, start = c(1999, 1), end = c(2022, 10))
test_data <- window(us_ts, start = c(2022, 11))

external_regressor <- merged_df$eu_cpi[merged_df$date >= as.Date("1999-01-01") & merged_df$date <= as.Date("2022-10-01")]
fit <- Arima(train_data, order = c(1, 0, 1), xreg = external_regressor)

forecast_values <- forecast(fit, xreg = merged_df$eu_cpi[merged_df$date >= as.Date("2022-11-01")], h = 3)
predicted_values <- forecast_values$mean
actual_values <- window(us_ts, start = c(2022, 11))
result_table <- tibble(
  Date = time(actual_values),
  Actual_Values = actual_values,
  Predicted_Values = predicted_values
)
plot(forecast_values, main = "ARIMAX Forecast for US Rate")
lines(actual_values, col = "blue")
legend("topleft", legend = c("Actual", "Forecast"), col = c("blue", "black"), lty = 1)

print(result_table)
---
title: "R Notebook"
output: html_notebook
---

This is an [R Markdown](http://rmarkdown.rstudio.com) Notebook. When you execute code within the notebook, the results appear beneath the code. 

Try executing this chunk by clicking the *Run* button within the chunk or by placing your cursor inside it and pressing *Ctrl+Shift+Enter*. 

```{r}
library(readxl)
library(lmtest) 
library(forecast)
library(DIMORA)
library(fpp2)
library(ggplot2)
library(plotly)
library(tseries)
library(randomForest)
library(BASS)
library(Metrics) 
library(dplyr)
library(tibble)
```


```{r}
# folder_path = "~/Desktop/unipd/time-series/project/data/"
folder_path = "./data/"

# shares_file <- paste0(folder_path, "us-total-share-prices.csv")
# m2_file <- paste0(folder_path, "us-M2.csv")
# usir_file <- paste0(folder_path, "us-interest-rate.csv")
euir_file <- paste0(folder_path, "eu-interest-rate.csv")
# uscpi_file <- paste0(folder_path, "us-consumer-price-index.csv")
eucpi_file <- paste0(folder_path, "eu-consumer-price-index.csv")
rate_file <- paste0(folder_path, "euro-daily-hist_1999_2022.csv")
  

# shares<- read.csv(shares_file)
# usm2 <- read.csv(m2_file)
# usir <- read.csv(usir_file)
euir <- read.csv(euir_file)
# uscpi <- read.csv(uscpi_file)
eucpi <- read.csv(eucpi_file)
rate <- read.csv(rate_file)
```

```{r}
# ### Looking at share price
# shares$DATE <- as.Date(shares$DATE)
# 
# # plot(shares$DATE, shares$SPASTT01USM661N, xlab = "Time", ylab = "Price")
# gg <- ggplot(shares, aes(x = DATE, y = SPASTT01USM661N))+
#   geom_line(aes(group = 1), color = "blue", linewidth = 0.5) +
#   geom_point() +
#   labs(
#     title = "Total Share Prices Change with Time",
#     x = "Time",
#     y = "Index 2015 = 100"
#   ) +
#   scale_x_date(date_labels = "%Y-%m", date_breaks = "1 year") +
#   theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))
# 
# plotly_gg <- ggplotly(gg)
# 
# plotly_gg
```

```{r}
### There is a clear increasing trend that is confirmed by the ACF being the highest
### at the smaller lags
# ggAcf(shares$SPASTT01USM661N, lag = 760)
```


```{r}
### Attempting modeling share prices with Naive Method
# nmshares_model <- meanf(shares$SPASTT01USM661N, h = 1)
# plot(nmshares_model)
```


```{r}
## Checking residuals
# nmshares_res <- residuals(nmshares_model)
# autoplot(ts(nmshares_res)) + xlab("Month") + ylab("") +
#   ggtitle("Residuals from Naive Method")
# gg_hist <- gghistogram(nmshares_res) + ggtitle("Histogram of Naive Method Residuals")
# ggplotly(gg_hist)
```


```{r}
# ggAcf(nmshares_res, lag = 760)
```


```{r}
### Attempting modeling share prices with linear regression model
# shares_lm = lm(shares$SPASTT01USM661N~ shares$DATE)
# summary(shares_lm) ###R^2 value of 83.96%
```

```{r}
# tt <- 1:NROW(shares)
# plot(tt, shares$SPASTT01USM661N, xlab="Time", ylab="Index 2015 = 100", type = "p")
# abline(shares_lm)
```


```{r}
head(euir)

euir$DATE <- as.Date(euir$DATE)
euir_df <- data.frame(date = euir$DATE, interest_rate = euir$IRSTCI01EZM156N)
```



```{r}
summary(euir_df$interest_rate)
```


```{r}
ggplot(euir_df, aes(x = date, y = interest_rate)) +
  geom_line() +
  labs(title = "Euro Interest Rate Over Time",
       x = "Date", y = "Interest Rate")
```


```{r}
# Check for Stationarity (Augmented Dickey-Fuller test)
adf.test(euir_df$interest_rate)
```

```{r}
# Autocorrelation and Partial Autocorrelation Plots
ggtsdisplay(euir_df$interest_rate, lag = 900)
```


```{r}
ggAcf(euir_df$interest_rate, lag.max = 700)
```

Linear regression model

```{r}
train_data <- euir_df[1:(nrow(euir_df) - 3), ]
test_data <- euir_df[(nrow(euir_df) - 2):nrow(euir_df), ]

model <- lm(interest_rate ~ date, data = train_data)

summary(model)

```

```{r}
predictions <- predict(model, newdata = test_data)
residuals <- residuals(model)
residuals_test <- residuals(model)[1:nrow(test_data)]
```

```{r}
rmse_value <- rmse(predictions, test_data$interest_rate)
mae_value <- mae(predictions, test_data$interest_rate)

cat("RMSE:", rmse_value, "\n")
cat("MAE:", mae_value, "\n")
```
```{r}
plot(test_data$date, test_data$interest_rate, col = "blue", type = "l", xlab = "Date", ylab = "Interest Rate")
lines(test_data$date, predictions, col = "red")
legend("topleft", legend = c("Actual", "Predicted"), col = c("blue", "red"), lty = 1)
```


```{r}
# Residuals plot
plot(test_data$date, residuals_test, col = "green", type = "l", xlab = "Date", ylab = "Residuals")

plot(train_data$date, residuals, col = "green", type = "l", xlab = "Date", ylab = "Residuals train")
```


```{r}
result_table <- data.frame(
  Date = test_data$date,
  Actual = test_data$interest_rate,
  Predicted = predictions
)

print(result_table)
```
```{r}
dwtest(model)
```

-----------------------------------------------------------------------------------------------------
ARIMA

```{r}
train_data <- euir_df[1:(nrow(euir_df) - 3), ]
test_data <- euir_df[(nrow(euir_df) - 2):nrow(euir_df), ]

arima_model <- auto.arima(train_data$interest_rate)

summary(arima_model)
```


```{r}
# Forecasting for the next 3 months
arima_forecast <- forecast(arima_model, h = 3)
print(arima_forecast)
```
```{r}
arima_pred_values <- arima_forecast$mean
```


```{r}
# Plotting ARIMA Forecast
plot(arima_forecast, xlab = "Date", ylab = "Interest Rate Forecast")
```
```{r}
# ARIMA residuals
arima_residuals <- residuals(arima_model)
plot(train_data$date, arima_residuals, col = "green", type = "l", xlab = "Date", ylab = "ARIMA Residuals")
```
```{r}
forecasted_values <- arima_forecast$mean
actual_values <- as.numeric(test_data$interest_rate)
arima_residuals_test <- actual_values - forecasted_values
```


```{r}
#ARIMA forecasted values and residuals
arima_table <- data.frame(
  Date = index(test_data),
  Actual_Values = actual_values,
  Forecasted_Interest_Rate = forecasted_values,
  Residuals = arima_residuals_test
)

# Print the ARIMA forecast and residuals table
print(arima_table)

```



```{r}
# Plotting ARIMA predicted values and residuals for the test data
plot(test_data$date, arima_pred_values, col = "blue", type = "l", xlab = "Date", ylab = "ARIMA Predicted Values")
lines(test_data$date, arima_residuals_test, col = "green")
legend("topright", legend = c("Predicted Values", "Residuals"), col = c("blue", "green"), lty = 1)

```


```{r}
```

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
```{r}
head(eucpi)

eucpi$DATE <- as.Date(eucpi$DATE)
eucpi_df <- data.frame(date = eucpi$DATE, cp_index = eucpi$EA19CPALTT01GYM)
```


```{r}
summary(eucpi_df$cp_index)
```


```{r}
ggplot(eucpi_df, aes(x = date, y = cp_index)) +
  geom_line() +
  labs(title = "Euro CP Index Over Time",
       x = "Date", y = "Index Rate")
```


```{r}
# Check for Stationarity (Augmented Dickey-Fuller test)
adf.test(eucpi_df$cp_index)
```


```{r}
# Autocorrelation and Partial Autocorrelation Plots
ggtsdisplay(eucpi_df$cp_index, lag = 900)
```

```{r}
ggAcf(eucpi_df$cp_index, lag.max = 700)
```

LINEAR REGRESSION
```{r}
train_data <- eucpi_df[1:(nrow(eucpi_df) - 3), ]
test_data <- eucpi_df[(nrow(eucpi_df) - 2):nrow(eucpi_df), ]

model <- lm(cp_index ~ date, data = train_data)

summary(model)
```

```{r}
predictions <- predict(model, newdata = test_data)
residuals <- residuals(model)
residuals_test <- residuals(model)[1:nrow(test_data)]
```


```{r}
rmse_value <- rmse(predictions, test_data$cp_index)
mae_value <- mae(predictions, test_data$cp_index)

cat("RMSE:", rmse_value, "\n")
cat("MAE:", mae_value, "\n")
```


```{r}
plot(test_data$date, test_data$cp_index, col = "blue", type = "l", xlab = "Date", ylab = "EU Consumer Price INdex")
lines(test_data$date, predictions, col = "red")
legend("topleft", legend = c("Actual", "Predicted"), col = c("blue", "red"), lty = 1)
```
```{r}
# Residuals plot
plot(test_data$date, residuals_test, col = "green", type = "l", xlab = "Date", ylab = "Residuals test")

plot(train_data$date, residuals, col = "green", type = "l", xlab = "Date", ylab = "Residuals train")
```
```{r}
result_table <- data.frame(
  Date = test_data$date,
  Actual = test_data$cp_index,
  Predicted = predictions
)

print(result_table)
```
```{r}
dwtest(model)
```

ARIMA (CP Index)
```{r}
train_data <- eucpi_df[1:(nrow(eucpi_df) - 3), ]
test_data <- eucpi_df[(nrow(eucpi_df) - 2):nrow(eucpi_df), ]

arima_model <- auto.arima(train_data$cp_index)

summary(arima_model)
```
```{r}
# Forecasting for the next 3 months
arima_forecast <- forecast(arima_model, h = 3)
arima_pred_values <- arima_forecast$mean
print(arima_forecast)
```
```{r}
# Plotting ARIMA Forecast
plot(arima_forecast, xlab = "Date", ylab = "CP Index Forecast")
```


```{r}
# ARIMA residuals
arima_residuals <- residuals(arima_model)
plot(train_data$date, arima_residuals, col = "green", type = "l", xlab = "Date", ylab = "ARIMA Residuals")
```


```{r}
forecasted_values <- arima_forecast$mean
actual_values <- as.numeric(test_data$cp_index)
arima_residuals_test <- actual_values - forecasted_values
```


```{r}
#ARIMA forecasted values and residuals
arima_table <- data.frame(
  Date = index(test_data),
  Actual_Values = actual_values,
  Forecasted_CP_Index = forecasted_values,
  Residuals = arima_residuals_test
)

# Print the ARIMA forecast and residuals table
print(arima_table)

```
```{r}
# Plotting ARIMA predicted values and residuals for the test data
plot(test_data$date, arima_pred_values, col = "blue", type = "l", xlab = "Date", ylab = "ARIMA Predicted Values")
lines(test_data$date, arima_residuals_test, col = "green")
legend("topright", legend = c("Predicted Values", "Residuals"), col = c("blue", "green"), lty = 1)
```

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

US RATE
```{r}
rate$Period.Unit. <- as.Date(rate$Period.Unit.)
rate_df <- data.frame(Date = rate$Period.Unit., US_rate = rate$X.US.dollar..)
```

```{r}
rate_df <- rate_df %>% 
  mutate(Date = format(Date, "%Y-%m"))
head(rate_df)
```
```{r}
filtered_data <- rate_df %>%
  group_by(Date) %>%
  summarize(mean_rate = mean(as.numeric(US_rate)))
```
```{r}
filtered_data$Date <- paste0(filtered_data$Date, '-01')
filtered_data$Date <- as.Date(filtered_data$Date)
head(filtered_data)
```

```{r}
summary(filtered_data$mean_rate)
```

```{r}
ggplot(filtered_data, aes(x = Date, y = mean_rate)) +
  geom_line() +
  labs(
    title = "US Rate Over Time",
    x = "Time", 
    y = "US Rate"
    )
```

```{r}
gg <- ggplot(filtered_data, aes(x = Date, y = mean_rate))+
  geom_line(aes(group = 1), color = "blue", linewidth = 0.5) +
  geom_point() +
  labs(
    title = "US Rate",
    x = "Time",
    y = "Rate"
  ) +
  scale_x_date(date_labels = "%Y-%m", date_breaks = "1 year") +
  theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))

plotly_gg <- ggplotly(gg)

plotly_gg
```
```{r}
str(euir_df)
str(filtered_data)
```

```{r}
merged_df <- merge(merge(euir_df, eucpi_df, by = "date"), filtered_data, by.x = "date", by.y = "Date")
names(merged_df) <- c("date", "eu_ir", "eu_cpi", "us_rate")
head(merged_df)
tail(merged_df)
```

ARIMAX (US rate + EU interest rate)
```{r}
merged_df$date <- as.Date(merged_df$date)
us_ts <- ts(merged_df$us_rate, frequency = 12, start = c(1999, 1))
```

```{r}
# Split the data into train and test sets
train_data <- window(us_ts, start = c(1999, 1), end = c(2022, 10))
test_data <- window(us_ts, start = c(2022, 11))

external_regressor <- merged_df$eu_ir[merged_df$date >= as.Date("1999-01-01") & merged_df$date <= as.Date("2022-10-01")]

```

```{r}
fit <- Arima(train_data, order = c(1, 0, 1), xreg = external_regressor)

forecast_values <- forecast(fit, xreg = merged_df$eu_ir[merged_df$date >= as.Date("2022-11-01")], h = 3)

```


```{r}
predicted_values <- forecast_values$mean
actual_values <- window(us_ts, start = c(2022, 11))
```


```{r}
result_table <- tibble(
  Date = time(actual_values),
  Actual_Values = actual_values,
  Predicted_Values = predicted_values
)
```

```{r}
plot(forecast_values, main = "ARIMAX Forecast for US Rate")
lines(actual_values, col = "blue")
legend("topleft", legend = c("Actual", "Forecast"), col = c("blue", "black"), lty = 1)

```
```{r}
print(result_table)
```
ARIMAX (US rate + EU Consumer Price Index)
```{r}
# Split the data into train and test sets
train_data <- window(us_ts, start = c(1999, 1), end = c(2022, 10))
test_data <- window(us_ts, start = c(2022, 11))

external_regressor <- merged_df$eu_cpi[merged_df$date >= as.Date("1999-01-01") & merged_df$date <= as.Date("2022-10-01")]
```


```{r}
fit <- Arima(train_data, order = c(1, 0, 1), xreg = external_regressor)

forecast_values <- forecast(fit, xreg = merged_df$eu_cpi[merged_df$date >= as.Date("2022-11-01")], h = 3)
```


```{r}
predicted_values <- forecast_values$mean
actual_values <- window(us_ts, start = c(2022, 11))
```


```{r}
result_table <- tibble(
  Date = time(actual_values),
  Actual_Values = actual_values,
  Predicted_Values = predicted_values
)
```


```{r}
plot(forecast_values, main = "ARIMAX Forecast for US Rate")
lines(actual_values, col = "blue")
legend("topleft", legend = c("Actual", "Forecast"), col = c("blue", "black"), lty = 1)

```


```{r}
print(result_table)
```


```{r}
```

